After slow interest, I have two interviews booked this week and another family interested in booking one too!

Sooooo...my question. I am trying to respond to the third family to book an interview, but should I tell them that I have two interviews booked this week and would prefer they interview this week as my spots for their age group may be filled by next week? This third family has the soonest start date, which is a huge bonus for my daycare (just starting up).

Just not sure how to mention that I am interviewing others this week too. Is that wrong to do?